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Financial Instruments - Schedule of Other Investments, at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Cost $ 39,192 $ 37,299
Carrying Value 38,323 42,772
Unrealized Gain / (Loss) (869) 5,473
Interests in securitizations [Member]
    
Schedule of Investments [Line Items]    
Cost 217 217
Carrying Value 77 88
Unrealized Gain / (Loss) (140) (129)
Equity securities [Member]
    
Schedule of Investments [Line Items]    
Cost 38,745 36,804
Carrying Value 37,991 42,417
Unrealized Gain / (Loss) (754) 5,613
Equity securities [Member] | EuroDekania [Member]
    
Schedule of Investments [Line Items]    
Cost 7,807 7,792
Carrying Value 2,054 2,370
Unrealized Gain / (Loss) (5,753) (5,422)
Equity securities [Member] | Star Asia [Member]
    
Schedule of Investments [Line Items]    
Cost 23,304 23,219
Carrying Value 30,169 37,358
Unrealized Gain / (Loss) 6,865 14,139
Equity securities [Member] | Tiptree [Member]
    
Schedule of Investments [Line Items]    
Cost 5,561 5,561
Carrying Value 2,834 2,533
Unrealized Gain / (Loss) (2,727) (3,028)
Equity securities [Member] | Star Asia Special Situations Fund [Member]
    
Schedule of Investments [Line Items]    
Cost 1,841  
Carrying Value 2,503  
Unrealized Gain / (Loss) 662  
Equity securities [Member] | Other securities [Member]
    
Schedule of Investments [Line Items]    
Cost 232 232
Carrying Value 431 156
Unrealized Gain / (Loss) 199 (76)
Residential loans [Member]
    
Schedule of Investments [Line Items]    
Cost 230 278
Carrying Value 255 267
Unrealized Gain / (Loss) $ 25 $ (11)